Abstract:

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Eight composite plates 400x410x2.15mm were fabricated from carbon/epoxy in
((0,90)4)s lay-up. To ensure there was no damage in the plates prior to the impact investigations the
plates were C-scanned. A drop test rig was used to apply a low velocity impact to the undamaged
plates. A rebound mechanism was employed to prevent secondary impacts.
AE sensors were selected for frequency and size due to the limited space on the test rig. Super
glue was used both as a couplant and also to secure the sensors in position. During the impact wave
streaming, time driven data and hit driven data were used to record the impact simultaneously. One
test was conducted on each sample with two impacts completed at 5J, 6J, 8J and 10J (total of 8
samples). The impacts were designed to allow only slight visible impact damage to be formed.
After completion of the impact investigation the plates were C-scanned to determine the area of
debonded material. Analysis of the data showed the complete record of the impact event from the
wave streaming, while the hit driven and time driven absolute energy data provided increasing
correlations with the area of composite damaged.

Abstract: In this study, an attempt has made to explore the low-velocity impact response of a Carbon/epoxy laminate (CFRP) and E-Glass/epoxy laminates (GFRP). The composite was reinforced with Graphene Nanoplatelets (GnPs) and impact energy absorption capacity was studied. The plain GFRP and plain CFRP were served as a baseline for comparison. These composite laminate plates were fabricated using hand layup technique. The tests were carried out on the laminate plate as per ASTM D5628 FD. Impact tests were performed using a specially designed vertical drop-weight testing machine with an impactor mass of 1.926 kg. The result shows that laminate plate reinforced with GnPs reinforcement enhances the impact energy absorption capacity of the composites almost 4.5 % in the case Carbon/epoxy laminate and 3.5 % in the case of and E-glass/epoxy laminate. The enhanced impact resistance could be attributed to increased interlaminar fracture toughness of the fibres.